import { ValidationErrorResult } from "./types";
/**
 * Formats the key for error messages.
 *
 * @param propertyName - The name of the property.
 * @param index - The index of the property (optional).
 * @returns The formatted key for error messages.
 */
export declare function formatErrorsKey<T>(propertyName?: keyof T, index?: number): string;
/**
 * Adds an error message to the specified property in the validation errors object.
 * @param propertyName - The name of the property to add the error to.
 * @param error - The error message to add.
 * @param errors - The validation errors object.
 */
export declare function addError(propertyName: string, error: string, errors?: ValidationErrorResult): void;